Krishna,

Review the ssh and sshd man pages. When using ssh -X it takes care of defining the DISPLAY and sending the X11 images to your screen. Defining DISPLY directly generally won't work (that is how you do it with rlogin but not with ssh).

Doug Reeder
On Jan 3, 2008, at 1:54 AM, Krishna Chaitanya wrote:

Hi Rolf,
            Thanks for that. There is still one minor problem, though. The xwindow is getting spawned on the remote machine and not on my local machine. It now looks like,
mpirun --prefix /usr/local -hostfile machines -x DISPLAY -x PATH  -np 2 xterm -e gdb peruse_ex1
            Please let me know what i can do to have it displayed on my machine. I have the DISPLAY variable set to 0.0 on both the machines and I am ssh-ing into the other machine by using the -X switch.

Thanks,
Krishna Chaitanya
            

On 1/2/08, Rolf Vandevaart <Rolf.Vandevaart@sun.com> wrote:
Krishna Chaitanya wrote:
> Hi,
>                I have been tracing the interactions between the PERUSE
> and MPI library,on one machine. I have been using gdb along with xterm
> to have two windows open at the same time as I step through the code. I
> wish to get a better glimpse of the working of the point to point calls,
> by launching the job on two machines and by tracing the flow in a
> similar manner. This is where I stand as of now :
>
> mpirun --prefix /usr/local -hostfile machines  -np 2 xterm -e gdb peruse_ex1
> xterm Xt error: Can't open display:
> xterm:  DISPLAY is not set
>
>                I tried using the display option for xterm and setting
> the value as 0.0, that was not of much help.
>                If someone can guide me as to where the DISPLAY parameter
> has to be set to allow the remote machine to open the xterm window, it
> will be of great help.
>
> Thanks,
> Krishna
>

I also do the the following:

-x DISPLAY -x PATH

In this way, both your DISPLAY and PATH settings make it to the remote node.

Rolf
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